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      <h2 class="mume-header" id="juc">JUC</h2>

<ul>
<li><a href="#juc">JUC</a>
<ul>
<li><a href="#1-jmm">1. JMM</a></li>
<li><a href="#2-volatile">2. volatile</a></li>
<li><a href="#3-sychronized">3. sychronized</a></li>
<li><a href="#4-happen-before">4. happen before</a></li>
<li><a href="#5-%E7%BA%BF%E7%A8%8B%E7%8A%B6%E6%80%81">5. &#x7EBF;&#x7A0B;&#x72B6;&#x6001;</a></li>
<li><a href="#6-synchronize">6. synchronize</a></li>
<li><a href="#7-%E5%86%85%E5%AD%98%E6%A8%A1%E5%9E%8B">7. &#x5185;&#x5B58;&#x6A21;&#x578B;</a></li>
<li><a href="#8-daemon%E7%BA%BF%E7%A8%8B">8. daemon&#x7EBF;&#x7A0B;</a></li>
<li><a href="#9-%E4%B8%AD%E6%96%AD">9. &#x4E2D;&#x65AD;</a></li>
<li><a href="#10-lock%E5%92%8Csynchronized%E7%9A%84%E5%8C%BA%E5%88%AB">10. Lock&#x548C;synchronized&#x7684;&#x533A;&#x522B;</a></li>
<li><a href="#11-%E9%98%9F%E5%88%97%E5%90%8C%E6%AD%A5%E5%99%A8">11. &#x961F;&#x5217;&#x540C;&#x6B65;&#x5668;</a></li>
<li><a href="#12-cas%E6%8C%87%E4%BB%A4">12. CAS&#x6307;&#x4EE4;</a></li>
</ul>
</li>
</ul>
<h3 class="mume-header" id="1-jmm">1. JMM</h3>

<p><img src="juc01.png" alt="juc01"></p>
<h3 class="mume-header" id="2-volatile">2. volatile</h3>

<p><img src="juc02.png" alt="juc02"><br>
<img src="juc03.png" alt="juc03"></p>
<h3 class="mume-header" id="3-sychronized">3. sychronized</h3>

<ul>
<li>&#x5BF9;&#x4E8E;&#x540C;&#x6B65;&#x5757;,&#x9501;&#x7684;&#x662F;sychronize&#x62EC;&#x53F7;&#x91CC;&#x7684;&#x5185;&#x5BB9;</li>
<li>&#x5BF9;&#x4E8E;&#x666E;&#x901A;&#x65B9;&#x6CD5;,&#x9501;&#x7684;&#x662F;&#x5B9E;&#x5217;&#x5BF9;&#x8C61;</li>
<li>&#x5BF9;&#x4E8E;&#x9759;&#x6001;&#x65B9;&#x6CD5;,&#x9501;&#x7684;&#x662F;class&#x5BF9;&#x8C61;<br>
&#x6BCF;&#x4E2A;&#x5BF9;&#x8C61;&#x90FD;&#x4F1A;&#x5173;&#x8054;&#x4E00;&#x4E2A;monitor,&#x83B7;&#x53D6;&#x9501;&#x5C31;&#x662F;&#x83B7;&#x53D6;&#x8BE5;&#x9501;&#x5BF9;&#x5E94;&#x5F97;monitor&#x7684;&#x6240;&#x6709;&#x6743;,&#x901A;&#x8FC7;moniterenter&#x548C;monitorexit&#x6307;&#x4EE4;&#x5B9E;&#x73B0;&#x52A0;&#x9501;&#x89E3;&#x9501;</li>
</ul>
<h3 class="mume-header" id="4-happen-before">4. happen before</h3>

<p>&#x4E00;&#x4E2A;&#x64CD;&#x4F5C;&#x7684;&#x6267;&#x884C;&#x7ED3;&#x679C;&#x5BF9;&#x53E6;&#x4E00;&#x4E2A;&#x64CD;&#x4F5C;&#x53EF;&#x89C1;,&#x5219;&#x79F0;&#x8BE5;&#x64CD;&#x4F5C;happen before &#x53E6;&#x4E00;&#x4E2A;&#x64CD;&#x4F5C;</p>
<p>&#x89C4;&#x5219;&#x5982;&#x4E0B;</p>
<p>&#x4E00;&#x4E2A;&#x7EBF;&#x7A0B;&#x4E2D;&#x7684;&#x6BCF;&#x4E2A;&#x64CD;&#x4F5C;happen before&#x4E0E;&#x5176;&#x540E;&#x7684;&#x6240;&#x6709;&#x64CD;&#x4F5C;<br>
&#x5BF9;&#x4E8E;&#x4E00;&#x4E2A;&#x9501;&#x7684;&#x89E3;&#x9501;&#x64CD;&#x4F5C;,happen before &#x4E0E;&#x5176;&#x540E;&#x7684;&#x52A0;&#x9501;&#x64CD;&#x4F5C;<br>
&#x5BF9;volatile&#x53D8;&#x91CF;&#x7684;&#x5199;&#x64CD;&#x4F5C;happen before&#x4E0E;&#x540E;&#x7EED;&#x7684;&#x6240;&#x6709;&#x8BFB;&#x64CD;&#x4F5C;<br>
&#x5982;&#x679C;A happen before B  B happen before C &#x5219; A happen before C<br>
&#x5982;&#x679C;&#x7EBF;&#x7A0B;A &#x8C03;&#x7528;&#x7EBF;&#x7A0B;B&#x7684;start()&#x65B9;&#x6CD5;,&#x90A3;&#x4E48;&#x8C03;&#x7528;&#x65B9;&#x6CD5;happen before &#x4E8E;&#x7EBF;&#x7A0B;B<br>
&#x5982;&#x679C;&#x7EBF;&#x7A0B;A &#x8C03;&#x7528;&#x7EBF;&#x7A0B;B&#x7684;join()&#x65B9;&#x6CD5;,&#x5982;&#x679C;B&#x6210;&#x529F;&#x8FD4;&#x56DE;,&#x90A3;&#x4E48;&#x7EBF;&#x7A0B;B&#x7684;&#x64CD;&#x4F5C;happen before&#x4E0E;&#x5176;&#x540E;&#x7684;A&#x7EBF;&#x7A0B;.<br>
&#x5728;&#x5355;&#x7EBF;&#x7A0B;&#x6216;&#x8005;&#x6B63;&#x786E;&#x7684;&#x540C;&#x6B65;&#x4E0B;&#x7684;&#x591A;&#x7EBF;&#x7A0B;,&#x7A0B;&#x5E8F;&#x7684;&#x6267;&#x884C;&#x7ED3;&#x679C;&#x4E3A;&#x6B63;&#x786E;&#x7684;</p>
<h3 class="mume-header" id="5-%E7%BA%BF%E7%A8%8B%E7%8A%B6%E6%80%81">5. &#x7EBF;&#x7A0B;&#x72B6;&#x6001;</h3>

<p><code>New</code>  &#x521D;&#x59CB;&#x72B6;&#x6001;,&#x7EBF;&#x7A0B;&#x88AB;&#x521B;&#x5EFA;,&#x4F46;&#x8FD8;&#x6CA1;&#x6709;&#x8C03;&#x7528;start()&#x65B9;&#x6CD5;<br>
<code>RUNNABLE</code>  &#x8FD0;&#x884C;&#x72B6;&#x6001;,&#x5305;&#x62EC;&#x8FD0;&#x884C;&#x548C;&#x5C31;&#x7EEA;&#x72B6;&#x6001;<br>
<code>BLOCKED</code>  &#x963B;&#x585E;&#x72B6;&#x6001;,&#x963B;&#x585E;&#x5728;&#x9501;&#x4E0A;<br>
<code>WAITING</code>  &#x7B49;&#x5F85;&#x72B6;&#x6001;,&#x8868;&#x793A;&#x7EBF;&#x7A0B;&#x8FDB;&#x5165;&#x7B49;&#x5F85;&#x72B6;&#x6001;,&#x7B49;&#x5F85;&#x901A;&#x77E5;&#x6216;&#x4E2D;&#x65AD;<br>
<code>TIME_WAITING</code> &#x8D85;&#x65F6;&#x7B49;&#x5F85;&#x72B6;&#x6001;<br>
<code>TERMINATED</code> &#x7EC8;&#x6B62;&#x72B6;&#x6001;,&#x8868;&#x793A;&#x7EBF;&#x7A0B;&#x6267;&#x884C;&#x5B8C;&#x6BD5;</p>
<h3 class="mume-header" id="6-synchronize">6. synchronize</h3>

<p>&#x6BCF;&#x4E2A;&#x5BF9;&#x8C61;&#x90FD;&#x6709;&#x4E00;&#x4E2A;monitor&#x76D1;&#x89C6;&#x5668;,&#x5728;&#x4F7F;&#x7528;synchronize&#x8FDB;&#x884C;&#x540C;&#x6B65;&#x64CD;&#x4F5C;&#x65F6;,&#x4F1A;&#x5C1D;&#x8BD5;&#x901A;&#x8FC7;monitorenter&#x83B7;&#x53D6;&#x5230;&#x9501;&#x5BF9;&#x8C61;&#x7684;&#x76D1;&#x89C6;&#x5668;,&#x82E5;&#x6210;&#x529F;&#x83B7;&#x53D6;,&#x5219;&#x5BF9;&#x5E94;&#x7684;&#x8BA1;&#x6570;&#x5668;+1,&#x8FDB;&#x5165;&#x540C;&#x6B65;&#x4EE3;&#x7801;&#x5757;,&#x5426;&#x5219;&#x5C06;&#x963B;&#x585E;&#x7EBF;&#x7A0B;,&#x901A;&#x8FC7;monitorexit,&#x5C06;&#x8BA1;&#x6570;&#x5668;-1,&#x5F53;&#x8BA1;&#x6570;&#x5668;&#x4E3A;0&#x65F6;,&#x91CA;&#x653E;&#x9501;&#x5BF9;&#x8C61;&#x7684;&#x76D1;&#x89C6;&#x5668;</p>
<h3 class="mume-header" id="7-%E5%86%85%E5%AD%98%E6%A8%A1%E5%9E%8B">7. &#x5185;&#x5B58;&#x6A21;&#x578B;</h3>

<p>&#x901A;&#x8FC7;&#x5B9A;&#x4E49;&#x4E00;&#x4E9B;happen before&#x89C4;&#x5219;,&#x4FDD;&#x8BC1;&#x5728;&#x5355;&#x7EBF;&#x7A0B;&#x6216;&#x6B63;&#x786E;&#x540C;&#x6B65;&#x7684;&#x591A;&#x7EBF;&#x7A0B;&#x4E0B;,&#x7A0B;&#x5E8F;&#x7684;&#x6267;&#x884C;&#x662F;&#x7B26;&#x5408;&#x7A0B;&#x5E8F;&#x5458;&#x9884;&#x60F3;&#x7684;&#x903B;&#x8F91;&#x987A;&#x5E8F;&#x7684;</p>
<h3 class="mume-header" id="8-daemon%E7%BA%BF%E7%A8%8B">8. daemon&#x7EBF;&#x7A0B;</h3>

<p>&#x5728;Java&#x4E2D;&#x6709;&#x4E24;&#x7C7B;&#x7EBF;&#x7A0B;&#xFF1A;User Thread(&#x7528;&#x6237;&#x7EBF;&#x7A0B;)&#x3001;Daemon Thread(&#x5B88;&#x62A4;&#x7EBF;&#x7A0B;)<br>
&#x5B88;&#x62A4;&#x7EBF;&#x7A0B;&#x4E3A;&#x7528;&#x6237;&#x7EBF;&#x7A0B;&#x63D0;&#x4F9B;&#x4E00;&#x4E9B;&#x652F;&#x6301;&#x6027;&#x5DE5;&#x4F5C;,&#x6BD4;&#x5982;&#x5783;&#x573E;&#x56DE;&#x6536;.&#x5F53;JVM&#x4E2D;&#x5B58;&#x5728;&#x7528;&#x6237;&#x7EBF;&#x7A0B;&#x65F6;,&#x5B88;&#x62A4;&#x7EBF;&#x7A0B;&#x5C06;&#x7EE7;&#x7EED;&#x5DE5;&#x4F5C;,&#x5F53;JVM&#x4E2D;&#x4E0D;&#x5B58;&#x5728;&#x7528;&#x6237;&#x7EBF;&#x7A0B;&#x65F6;,&#x5B88;&#x62A4;&#x7EBF;&#x7A0B;&#x5C06;&#x548C;JVM&#x4E00;&#x8D77;&#x7ED3;&#x675F;&#x5DE5;&#x4F5C;</p>
<h3 class="mume-header" id="9-%E4%B8%AD%E6%96%AD">9. &#x4E2D;&#x65AD;</h3>

<p>&#x53EF;&#x4EE5;&#x7406;&#x89E3;&#x5176;&#x4ED6;&#x7EBF;&#x7A0B;&#x5BF9;&#x4E2D;&#x65AD;&#x7EBF;&#x7A0B;&#x6253;&#x4E86;&#x4E2A;&#x62DB;&#x547C;.&#x88AB;&#x4E2D;&#x65AD;&#x7684;&#x7EBF;&#x7A0B;&#x8C03;&#x7528;isinterrupted&#x65B9;&#x6CD5;&#x65F6;&#x5C06;&#x653E;&#x56DE;true,&#x8BB8;&#x591A;&#x65B9;&#x6CD5;&#x4F1A;&#x629B;&#x51FA;&#x4E2D;&#x65AD;&#x5F02;&#x5E38;,&#x5E76;&#x5C06;&#x4E2D;&#x65AD;&#x5C5E;&#x6027;&#x91CD;&#x7F6E;,&#x6BD4;&#x5982;Thread.sleep&#x64CD;&#x4F5C;,&#x629B;&#x51FA;&#x5F02;&#x5E38;&#x540E;,&#x8C03;&#x7528;isinterrupted&#x65B9;&#x6CD5;&#x5C06;&#x8FD4;&#x56DE;false</p>
<h3 class="mume-header" id="10-lock%E5%92%8Csynchronized%E7%9A%84%E5%8C%BA%E5%88%AB">10. Lock&#x548C;synchronized&#x7684;&#x533A;&#x522B;</h3>

<p>Lock&#x7684;&#x4F7F;&#x7528;&#x66F4;&#x7075;&#x6D3B;<br>
Lock&#x53EF;&#x4EE5;&#x975E;&#x963B;&#x585E;&#x5F0F;&#x7684;&#x83B7;&#x53D6;&#x9501;<br>
Lock&#x53EF;&#x4EE5;&#x8D85;&#x65F6;&#x83B7;&#x53D6;&#x9501;,&#x53EF;&#x4EE5;&#x91C7;&#x7528;&#x53EF;&#x88AB;&#x4E2D;&#x65AD;&#x7684;&#x65B9;&#x5F0F;&#x83B7;&#x53D6;&#x9501;</p>
<h3 class="mume-header" id="11-%E9%98%9F%E5%88%97%E5%90%8C%E6%AD%A5%E5%99%A8">11. &#x961F;&#x5217;&#x540C;&#x6B65;&#x5668;</h3>

<p>&#x901A;&#x8FC7;&#x5728;&#x9501;&#x7684;&#x5B9E;&#x73B0;&#x4E2D;&#x805A;&#x5408;&#x540C;&#x6B65;&#x5668;,&#x5229;&#x7528;&#x6A21;&#x677F;&#x65B9;&#x6CD5;&#x6A21;&#x5F0F;,&#x91CD;&#x5199;&#x4E00;&#x4E9B;&#x65B9;&#x6CD5;,&#x7B80;&#x5316;&#x9501;&#x7684;&#x5B9E;&#x73B0;.&#x5C4F;&#x853D;&#x4E86;&#x540C;&#x6B65;&#x72B6;&#x6001;&#x7684;&#x7BA1;&#x7406;,&#x7EBF;&#x7A0B;&#x7684;&#x6392;&#x961F;,&#x7B49;&#x5F85;,&#x5524;&#x9192;&#x7B49;&#x5E95;&#x5C42;&#x64CD;&#x4F5C;</p>
<h3 class="mume-header" id="12-cas%E6%8C%87%E4%BB%A4">12. CAS&#x6307;&#x4EE4;</h3>

<p>CAS&#x4F7F;&#x7528;&#x672C;&#x5730;&#x65B9;&#x6CD5;,&#x4EE5;&#x539F;&#x5B50;&#x7684;&#x65B9;&#x5F0F;&#x5BF9;&#x5185;&#x5B58;&#x6267;&#x884C;&#x8BFB;-&#x6539;-&#x5199;&#x7684;&#x64CD;&#x4F5C;</p>

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